Jessica Ennis has ruled out a heavyweight Olympic showdown with Sally Pearson in the 100m hurdles, preferring instead to savour the moment of her historic heptathlon triumph.

Ennis began her march towards heptathlon gold with a scintillating run of 12.54 seconds in the hurdles on Friday, a time good enough to have won four of the last five Olympic gold medals in the individual event.

It also smashed the British record and gave the first indication that the newly-laid track at the Olympic Stadium was super fast.

Ennis, 26, had entered the 100m hurdles, which begins with the heats on Monday, before deciding on Sunday morning to was time to put her feet up.

"Right now I'm just going to enjoy this moment for as long as I possibly can, spend some time with my family and then have a break and relax," Ennis told the BBC.

"It's being a long build-up and it's been stressful.

"I did think about it (contesting the 100m hurdles) especially when I ran a personal best in the hurdles.

"But for me it was just about the heptathlon. I'm more than happy with that and I think I just need to rest now."

Although Ennis would have been unlikely to challenge Pearson for the gold medal if the red-hot favourite from Australia was at her best, she would inevitably have taken a large slice of the limelight.

As is usually the case in the sprint hurdles, the biggest challenge for reigning IAAF female world athlete of the year Pearson is likely to come from the United States.

Kellie Wells is the only woman to have beaten the feisty Australian in 2012, having pipped her to the line in atrocious conditions last month at Crystal Palace.

Dawn Harper is the defending Olympic champion and Lolo Jones is the most hyped member of the US trio.

Jamaica's Brigitte Foster-Hylton - the 2009 world champion - will also fancy her chances.

But in reality the event is Pearson's to lose.

"I know how to keep myself grounded," said the Queenslander, who was a surprise silver medallist behind Harper at the Beijing Olympics when still aged 21.

"I know how to stay focused. I know how to stay hungry.

"I think that's what keeps me fast and at my best is because I have always stayed hungry and I know that these girls can beat me, they have done it before.

"I know it is going to be tough - these are the Olympic Games."

The heats are on Monday morning, with the semi-finals and final on Tuesday evening.

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